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#!/bin/sh
set -e
usage() {
cat <<EOF
Usage: `basename $0` [OPTIONS]
Create partition file to be used to flash GPT on DragonBoard
-d enable debug traces
-a <dir> output dir to create gpt_main.bin, gpt_backup.bin and gpt_both.bin
-o <file> output file (will be destroyed if exists)
-i <file> GPT backup file
-x enable shell debug mode
-h display help
EOF
exit 1;
}
DEBUG=0
while getopts "a:o:i:s:dx" o; do
case "${o}" in
x|d)
set -x
DEBUG=1
;;
a)
OUT_DIR=${OPTARG}
;;
o)
OUT=${OPTARG}
;;
i)
IN=${OPTARG}
;;
*)
usage
;;
esac
done
shift $((OPTIND-1))
if [ -z "$OUT_DIR" ] && [ -z "$OUT" ] || [ -z "$IN" ] ; then
echo "Please specify an output and input file"
echo ""
usage
exit 1
fi
# The GPT backup is a binary file consisting of the protective MBR,
# the main GPT header, the backup GPT header, and one copy of the
# partition table, in that order.
MBR=`mktemp`
PRIMARY=`mktemp`
SECONDARY=`mktemp`
DATA=`mktemp`
echo "=== Extract MBR, Primary and Secondary headers, and partition table"
dd if=$IN of=$MBR bs=512 count=1 > /dev/null 2>&1
dd if=$IN of=$PRIMARY bs=512 count=1 skip=1 > /dev/null 2>&1
dd if=$IN of=$SECONDARY bs=512 count=1 skip=2 > /dev/null 2>&1
dd if=$IN of=$DATA bs=512 count=32 skip=3 > /dev/null 2>&1
echo "=== Create file(s)"
if [ -n "$OUT_DIR" ] ; then
cat $MBR $PRIMARY $DATA > $OUT_DIR/gpt_main.bin
cat $DATA $SECONDARY > $OUT_DIR/gpt_backup.bin
cat $OUT_DIR/gpt_main.bin $OUT_DIR/gpt_backup.bin > $OUT_DIR/gpt_both.bin
else
cat $MBR $PRIMARY $DATA $DATA $SECONDARY > $OUT
fi
if [ "$DEBUG" = "1" ] ;then
if [ -n "$OUT" ]; then
ls -l $MBR $PRIMARY $DATA $DATA $SECONDARY $OUT
else
ls -l $MBR $PRIMARY $DATA $DATA $SECONDARY $OUT_DIR/gpt_{main,backup,both}.bin
fi
fi
rm -f $MBR $PRIMARY $DATA $SECONDARY
echo "=== Done"
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